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Wide stingaree
The wide stingaree (''Urolophus expansus'') is a little-known species of stingray in the family Urolophidae, found off southwestern Australia. It typically occurs over sand in water deep around the edge of the continental shelf. This species has a broad diamond-shaped pectoral fin disc, a slightly pointed snout, and a tail with a leaf-like caudal fin, skin folds along either side, and no dorsal fins. Between its nostrils is a skirt-shaped curtain of skin. It is grayish green above, with faint bluish lines beside and behind the eyes. The maximum length on record is .
The diet of the wide stingaree consists mainly of isopods and polychaete worms. It is aplacental viviparous, with the females supplying their unborn young with histotroph ("uterine milk"). This species is regularly caught incidentally by commercial trawl fisheries operating in the Great Australian Bight. Although it is unlikely to survive being captured and also tends to abort any gestating young during the process, large portions of the wide stingaree's range see little to no fishing activity and overall the species is not threatened. The International Union for Conservation of Nature (IUCN) has listed it under Least Concern.
==Taxonomy==
The first known specimens of the wide stingaree were collected from the Great Australian Bight by the research vessel FIS ''Endeavour'', and described by Australian ichthyologist Alan Riverstone McCulloch in an 1916 volume of the scientific journal ''Biological Results Endeavour''. The specific epithet ''expansus'' means "spread out" or "expanded" in Latin. Another common name for this species is broadbacked stingaree.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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